American Airlines flight 11 was the flight number of one of the airplanes used in the September 11, 2001 Terrorist Attack that crashed into the North Tower of the World Trade Center in New York City.
This American Airlines morning flight from Boston to Los Angeles (BOS-LAX) was hijacked soon after take-off at 8:02 EDT on September 11, 2001. At 8:46 AM EDT the Boeing 767 was deliberately crashed into the north side of Tower 1 of the World Trade Center approximately between the 94 and 98 floors. The plane was carrying 81 passengers (including the 5 hijackers) and 11 crew. All on board along with many hundreds in the building were killed and the tower later collapsed.
Although the impact itself caused extensive structural damage, it was the burning jet fuel which is blamed for the structural failure of the world's 3rd tallest building. Many have speculated that this is the reason why the hijackers choose to use this fully fueled trans-continental flight.
Flight 11 has since been renumbered Flight 25.
See also: September 11, 2001 Terrorist Attack/Hijackers, AA 11 flight manifest